/* * Copyright (C) 2009 by Sascha Hauer, Pengutronix * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/list.h> #include <linux/clk.h> #include <linux/io.h> #include <asm/clkdev.h> #include <mach/clock.h> #include <mach/hardware.h> #include <mach/common.h> #include <mach/mx25.h> #define CRM_BASE MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR) #define CCM_MPCTL 0x00 #define CCM_UPCTL 0x04 #define CCM_CCTL 0x08 #define CCM_CGCR0 0x0C #define CCM_CGCR1 0x10 #define CCM_CGCR2 0x14 #define CCM_PCDR0 0x18 #define CCM_PCDR1 0x1C #define CCM_PCDR2 0x20 #define CCM_PCDR3 0x24 #define CCM_RCSR 0x28 #define CCM_CRDR 0x2C #define CCM_DCVR0 0x30 #define CCM_DCVR1 0x34 #define CCM_DCVR2 0x38 #define CCM_DCVR3 0x3c #define CCM_LTR0 0x40 #define CCM_LTR1 0x44 #define CCM_LTR2 0x48 #define CCM_LTR3 0x4c static unsigned long get_rate_mpll(void) { ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL); return mxc_decode_pll(mpctl, 24000000); } static unsigned long get_rate_upll(void) { ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL); return mxc_decode_pll(mpctl, 24000000); } unsigned long get_rate_arm(struct clk *clk) { unsigned long cctl = readl(CRM_BASE + CCM_CCTL); unsigned long rate = get_rate_mpll(); if (cctl & (1 << 14)) rate = (rate * 3) >> 1; return rate / ((cctl >> 30) + 1); } static unsigned long get_rate_ahb(struct clk *clk) { unsigned long cctl = readl(CRM_BASE + CCM_CCTL); return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1); } static unsigned long get_rate_ipg(struct clk *clk) { return get_rate_ahb(NULL) >> 1; } static unsigned long get_rate_per(int per) { unsigned long ofs = (per & 0x3) * 8; unsigned long reg = per & ~0x3; unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f; unsigned long fref; if (readl(CRM_BASE + 0x64) & (1 << per)) fref = get_rate_upll(); else fref = get_rate_ipg(NULL); return fref / (val + 1); } static unsigned long get_rate_uart(struct clk *clk) { return get_rate_per(15); } static unsigned long get_rate_ssi2(struct clk *clk) { return get_rate_per(14); } static unsigned long get_rate_ssi1(struct clk *clk) { return get_rate_per(13); } static unsigned long get_rate_i2c(struct clk *clk) { return get_rate_per(6); } static unsigned long get_rate_nfc(struct clk *clk) { return get_rate_per(8); } static unsigned long get_rate_gpt(struct clk *clk) { return get_rate_per(5); } static unsigned long get_rate_lcdc(struct clk *clk) { return get_rate_per(7); } static unsigned long get_rate_esdhc1(struct clk *clk) { return get_rate_per(3); } static unsigned long get_rate_esdhc2(struct clk *clk) { return get_rate_per(4); } static unsigned long get_rate_csi(struct clk *clk) { return get_rate_per(0); } static unsigned long get_rate_otg(struct clk *clk) { unsigned long cctl = readl(CRM_BASE + CCM_CCTL); unsigned long rate = get_rate_upll(); return (cctl & (1 << 23)) ? 0 : rate / ((0x3F & (cctl >> 16)) + 1); } static int clk_cgcr_enable(struct clk *clk) { u32 reg; reg = __raw_readl(clk->enable_reg); reg |= 1 << clk->enable_shift; __raw_writel(reg, clk->enable_reg); return 0; } static void clk_cgcr_disable(struct clk *clk) { u32 reg; reg = __raw_readl(clk->enable_reg); reg &= ~(1 << clk->enable_shift); __raw_writel(reg, clk->enable_reg); } #define DEFINE_CLOCK(name, i, er, es, gr, sr, s) \ static struct clk name = { \ .id = i, \ .enable_reg = CRM_BASE + er, \ .enable_shift = es, \ .get_rate = gr, \ .set_rate = sr, \ .enable = clk_cgcr_enable, \ .disable = clk_cgcr_disable, \ .secondary = s, \ } /* * Note: the following IPG clock gating bits are wrongly marked "Reserved" in * the i.MX25 Reference Manual Rev 1, table 15-13. The information below is * taken from the Freescale released BSP. * * bit reg offset clock * * 0 CGCR1 0 AUDMUX * 12 CGCR1 12 ESAI * 16 CGCR1 16 GPIO1 * 17 CGCR1 17 GPIO2 * 18 CGCR1 18 GPIO3 * 23 CGCR1 23 I2C1 * 24 CGCR1 24 I2C2 * 25 CGCR1 25 I2C3 * 27 CGCR1 27 IOMUXC * 28 CGCR1 28 KPP * 30 CGCR1 30 OWIRE * 36 CGCR2 4 RTIC * 51 CGCR2 19 WDOG */ DEFINE_CLOCK(gpt_clk, 0, CCM_CGCR0, 5, get_rate_gpt, NULL, NULL); DEFINE_CLOCK(uart_per_clk, 0, CCM_CGCR0, 15, get_rate_uart, NULL, NULL); DEFINE_CLOCK(ssi1_per_clk, 0, CCM_CGCR0, 13, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(ssi2_per_clk, 0, CCM_CGCR0, 14, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(cspi1_clk, 0, CCM_CGCR1, 5, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(cspi2_clk, 0, CCM_CGCR1, 6, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(cspi3_clk, 0, CCM_CGCR1, 7, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(esdhc1_ahb_clk, 0, CCM_CGCR0, 21, get_rate_esdhc1, NULL, NULL); DEFINE_CLOCK(esdhc1_per_clk, 0, CCM_CGCR0, 3, get_rate_esdhc1, NULL, &esdhc1_ahb_clk); DEFINE_CLOCK(esdhc2_ahb_clk, 0, CCM_CGCR0, 22, get_rate_esdhc2, NULL, NULL); DEFINE_CLOCK(esdhc2_per_clk, 0, CCM_CGCR0, 4, get_rate_esdhc2, NULL, &esdhc2_ahb_clk); DEFINE_CLOCK(fec_ahb_clk, 0, CCM_CGCR0, 23, NULL, NULL, NULL); DEFINE_CLOCK(lcdc_ahb_clk, 0, CCM_CGCR0, 24, NULL, NULL, NULL); DEFINE_CLOCK(lcdc_per_clk, 0, CCM_CGCR0, 7, NULL, NULL, &lcdc_ahb_clk); DEFINE_CLOCK(csi_ahb_clk, 0, CCM_CGCR0, 18, get_rate_csi, NULL, NULL); DEFINE_CLOCK(csi_per_clk, 0, CCM_CGCR0, 0, get_rate_csi, NULL, &csi_ahb_clk); DEFINE_CLOCK(uart1_clk, 0, CCM_CGCR2, 14, get_rate_uart, NULL, &uart_per_clk); DEFINE_CLOCK(uart2_clk, 0, CCM_CGCR2, 15, get_rate_uart, NULL, &uart_per_clk); DEFINE_CLOCK(uart3_clk, 0, CCM_CGCR2, 16, get_rate_uart, NULL, &uart_per_clk); DEFINE_CLOCK(uart4_clk, 0, CCM_CGCR2, 17, get_rate_uart, NULL, &uart_per_clk); DEFINE_CLOCK(uart5_clk, 0, CCM_CGCR2, 18, get_rate_uart, NULL, &uart_per_clk); DEFINE_CLOCK(nfc_clk, 0, CCM_CGCR0, 8, get_rate_nfc, NULL, NULL); DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL, NULL); DEFINE_CLOCK(pwm1_clk, 0, CCM_CGCR1, 31, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(pwm2_clk, 0, CCM_CGCR2, 0, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(pwm3_clk, 0, CCM_CGCR2, 1, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(pwm4_clk, 0, CCM_CGCR2, 2, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(kpp_clk, 0, CCM_CGCR1, 28, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(tsc_clk, 0, CCM_CGCR2, 13, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(i2c_clk, 0, CCM_CGCR0, 6, get_rate_i2c, NULL, NULL); DEFINE_CLOCK(fec_clk, 0, CCM_CGCR1, 15, get_rate_ipg, NULL, &fec_ahb_clk); DEFINE_CLOCK(dryice_clk, 0, CCM_CGCR1, 8, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(lcdc_clk, 0, CCM_CGCR1, 29, get_rate_lcdc, NULL, &lcdc_per_clk); DEFINE_CLOCK(wdt_clk, 0, CCM_CGCR2, 19, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(ssi1_clk, 0, CCM_CGCR2, 11, get_rate_ssi1, NULL, &ssi1_per_clk); DEFINE_CLOCK(ssi2_clk, 1, CCM_CGCR2, 12, get_rate_ssi2, NULL, &ssi2_per_clk); DEFINE_CLOCK(esdhc1_clk, 0, CCM_CGCR1, 13, get_rate_esdhc1, NULL, &esdhc1_per_clk); DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGCR1, 14, get_rate_esdhc2, NULL, &esdhc2_per_clk); DEFINE_CLOCK(audmux_clk, 0, CCM_CGCR1, 0, NULL, NULL, NULL); DEFINE_CLOCK(csi_clk, 0, CCM_CGCR1, 4, get_rate_csi, NULL, &csi_per_clk); DEFINE_CLOCK(can1_clk, 0, CCM_CGCR1, 2, get_rate_ipg, NULL, NULL); DEFINE_CLOCK(can2_clk, 0, CCM_CGCR1, 3, get_rate_ipg, NULL, NULL); #define _REGISTER_CLOCK(d, n, c) \ { \ .dev_id = d, \ .con_id = n, \ .clk = &c, \ }, static struct clk_lookup lookups[] = { _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk) _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk) _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk) _REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk) _REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk) _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk) _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk) _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk) _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk) _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk) _REGISTER_CLOCK("imx25-cspi.0", NULL, cspi1_clk) _REGISTER_CLOCK("imx25-cspi.1", NULL, cspi2_clk) _REGISTER_CLOCK("imx25-cspi.2", NULL, cspi3_clk) _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk) _REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk) _REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk) _REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk) _REGISTER_CLOCK("imx-keypad", NULL, kpp_clk) _REGISTER_CLOCK("mx25-adc", NULL, tsc_clk) _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk) _REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk) _REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk) _REGISTER_CLOCK("fec.0", NULL, fec_clk) _REGISTER_CLOCK("imxdi_rtc.0", NULL, dryice_clk) _REGISTER_CLOCK("imx-fb.0", NULL, lcdc_clk) _REGISTER_CLOCK("imx-wdt.0", NULL, wdt_clk) _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk) _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk) _REGISTER_CLOCK(NULL, "sdhc", esdhc1_clk) _REGISTER_CLOCK(NULL, "sdhc", esdhc2_clk) _REGISTER_CLOCK("mx2-camera.0", NULL, csi_clk) _REGISTER_CLOCK(NULL, "audmux", audmux_clk) _REGISTER_CLOCK("flexcan.0", NULL, can1_clk) _REGISTER_CLOCK("flexcan.1", NULL, can2_clk) }; int __init mx25_clocks_init(void) { clkdev_add_table(lookups, ARRAY_SIZE(lookups)); /* Turn off all clocks except the ones we need to survive, namely: * EMI, GPIO1-3 (CCM_CGCR1[18:16]), GPT1, IOMUXC (CCM_CGCR1[27]), IIM, * SCC */ __raw_writel((1 << 19), CRM_BASE + CCM_CGCR0); __raw_writel((0xf << 16) | (3 << 26), CRM_BASE + CCM_CGCR1); __raw_writel((1 << 5), CRM_BASE + CCM_CGCR2); #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC) clk_enable(&uart1_clk); #endif /* Clock source for lcdc and csi is upll */ __raw_writel(__raw_readl(CRM_BASE+0x64) | (1 << 7) | (1 << 0), CRM_BASE + 0x64); mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54); return 0; }